Add cell groups treatment to refine for 1D mesh.
Add cell groups treatment to refine for 1D mesh.

BubuLK/sfepy,rc/sfepy,sfepy/sfepy,sfepy/sfepy,BubuLK/sfepy,vlukes/sfepy,vlukes/sfepy,rc/sfepy,rc/sfepy,vlukes/sfepy,sfepy/sfepy,BubuLK/sfepy